you also say in your book that president bush -- his heart wasn't really into it. >> well, they came to grip it but it was late on in the presidency and that's the important distinction with president obama now. i mean, i -- i think you cannot overstate the importance of president obama coming in, saying, right from the beginning, we're going to grip this. because that allows you, you see, to go through what will inevitably be the ups and downs. >> reporter: and as combat in iraq ends, blair describes his regret at the lives lost. his book is a personal reflection of the many relationships he had with presidents, prime ministers and even princesses, like diana. you were right there when her whole sort of final phase of relationships, she had divorced prince charles, she had the two children, obviously and she was going out with dodi fayed. that was causing consternation you write, and you had to confront her about it. >> i talked to her about it, and i was worried.